DefaultsTestPluginManager.php

<?php

/**
 * @file
 * Contains Drupal\plugin_test\Plugin\DefaultsTestPluginManager.
 */
namespace Drupal\plugin_test\Plugin;

use Drupal\Component\Plugin\PluginManagerBase;
use Drupal\Component\Plugin\Discovery\StaticDiscovery;
use Drupal\Component\Plugin\Discovery\ProcessDecorator;
use Drupal\Component\Plugin\Factory\DefaultFactory;

/**
 * Defines a plugin manager used by Plugin API unit tests.
 */
class DefaultsTestPluginManager extends PluginManagerBase {
  public function __construct() {

    // Create the object that can be used to return definitions for all the
    // plugins available for this type. Most real plugin managers use a richer
    // discovery implementation, but StaticDiscovery lets us add some simple
    // mock plugins for unit testing.
    $this->discovery = new StaticDiscovery();
    $this->discovery = new ProcessDecorator($this->discovery, array(
      $this,
      'ProcessDefinition',
    ));
    $this->factory = new DefaultFactory($this->discovery);

    // Specify default values.
    $this->defaults = array(
      'metadata' => array(
        'default' => TRUE,
      ),
    );

    // Add a plugin with a custom value.
    $this->discovery
      ->setDefinition('test_block1', array(
      'class' => 'Drupal\\plugin_test\\Plugin\\plugin_test\\mock_block\\MockTestBlock',
      'metadata' => array(
        'custom' => TRUE,
      ),
    ));

    // Add a plugin that overrides the default value.
    $this->discovery
      ->setDefinition('test_block2', array(
      'class' => 'Drupal\\plugin_test\\Plugin\\plugin_test\\mock_block\\MockTestBlock',
      'metadata' => array(
        'custom' => TRUE,
        'default' => FALSE,
      ),
    ));
  }

}